Business vertical refers to:

Joint venture
Different businesses within a group
Competitors in business
All of the above

The correct answer is: B. Different businesses within a group.

A business vertical is a group of businesses that are all related to the same industry or sector. For example, a company that sells cars, trucks, and SUVs would be considered to be in the automotive vertical.

A joint venture is a business arrangement between two or more companies to undertake a specific project or business activity.

Competitors in business are companies that are trying to sell the same products or services to the same customers.

Therefore, the correct answer is B. Different businesses within a group.